UITF Meeting - November 6, 2017

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UITF keV beam in one month (Dec. 1, 2017)

Last bake of the gun! But before the bake, get the Prep chamber working Prep chamber (if we don’t need to vent)

  • Load NF3
  • Heat puck to 550C for two hours, note vacuum
  • White light activation, or with diode laser, verify Cs is good. verify Li is good

Prep chamber (if we need to vent):

  • replace bad NF3 valve (if deemed bad),
  • install two new pucks – one with bulk GaAs, one with strained superlattice sample B1054, or another “B” sample. Do we have two spare pucks, how do they compare to new design?
  • Check puck fit up inside gun (pull mirror puck if it is installed, what is inside the gun now?)
  • Schneedle is long, mark the manipulator for puck installation

What else to make “simple” beam?

Epics control of:

  • Valves
  • Magnets
  • Viewers
  • Video to control room
  • Current monitoring at cup, dump and apertures. Cables connected to ammeters
  • Gun HV control
  • UHV ion pumps
  • Decarad
  • Water flow signal to fsd card
  • What else to fsd card? BLM
  • RF to seed laser
  • Attenuator
  • Power meter
  • x/y stage
  • tune mode generator
  • SCAM
  • Epics screens

What else later? By Feb 5, hopefully sooner

  • BPMs
  • RF to buncher
  • RF to choppers
  • Water skids functional
  • OSP for buncher and choppers

By February 5, 2018

  • All cryo work complete
  • All High Power RF work complete
  • OSP for QCM approved
  • ODH assessment, vent can on relief stack, penetrations filled, etc,

To do:

  • Get another shed electrode made, since we will need this electrode for the gun we pull from the tunnel
  • GN2 manifolds, clean polyflo
  • Tools, tool boxes
  • Vacuum cabinet, with vacuum hardware
  • Aluminum foil
  • Dress ion pump cables


  • mA polarized beam lifetime tests, lifetime vs laser spot size (continue Joe’s work)
  • Other lifetime studies: vs gun voltage, vs active area (3, 5, 7 mm), vs color of light, vs photocathode thickness and cleave plane, bulk vs superlattice
  • Lifetime vs oxidant (NF3, N2O, O2)
  • GaAs activated with Cs and Li: bi-alkali lifetime tests
  • Wein as precipitator
  • GaAs/GaAsP with and without DBR, GaAsSb/AlGaAs, and GaAsSb/AlGaAsP photocathode lifetime tests
  • Add an H-cleaner to the prep chamber
  • Brock cavity bunchlength measurements, vs buncher power, pump/probe test